Computer Science - Computer Hardware - Discussion

It is AT 20 and ATX 24.

ATX has 24 pins while AT 20 pins.

What is the difference between AT and ATX Motherboard?

How to identify the ATX motherboad?

Is form factor is ratio of any two values?

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This is nice questions to learn more thing. Thanks.

AT connector is 20 pins connector and ATX is 24 pins connector.

But AT-20 pin & ATX-24 pin.

The 20-pin main power connector is standard for all power supplies conforming to the ATX and ATX12V 1.x power supply form factors and consists of a Molex Mini-Fit Jr. Connector housing with female terminals. For reference, the connector is Molex part number 39-01-2200 (or equivalent) , and the standard terminals are part number 5556 (see the following figure). This is a 20-pin keyed connector with pins configured as shown in the next table. The colors for the wires listed are those the ATX standard recommends; however, to enable them to vary from manufacturer to manufacturer, they are not required for compliance to the specification. I like to show these connector pinouts in a wire end view, which shows how the pins are arranged looking at the back of the connector (from the wire and not the terminal end). This way, you can see how they would be oriented if you were back-probing the connector with the connector plugged in.

ATX 20-pin motherboard main power connector, perspective view. ATX 20-pin motherboard main power connector, perspective view.

ATX 20-pin main power connector, side and terminal end view. ATX 20-pin main power connector, side and terminal end view.

What is the difference between ATX, AT & Baby AT?